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tests/pc.c
83 строки
2 KB
Dmitry V. Levin
Update copyright headers
01 дек 2021, 11:00
01 дек 2021, 11:00
fd92d52
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/* * Copyright (c) 2015-2020 Dmitry V. Levin <ldv@strace.io> * Copyright (c) 2015-2021 The strace developers. * All rights reserved. * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "tests.h" #include "scno.h" #include <assert.h> #include <dlfcn.h> #include <fcntl.h> #include <unistd.h> #include <sys/mman.h> #include <sys/wait.h> #include <sys/sendfile.h> #include <sys/prctl.h> int main(void) { const unsigned long pagesize = get_page_size(); #ifdef __s390__ /* * The si_addr field is unreliable: * https://marc.info/?l=linux-s390&m=142515870124248&w=2 */ error_msg_and_skip("s390: si_addr is unreliable"); #endif /* write instruction pointer length to the log */ assert(syscall(__NR_write, -1, (void *) 8UL, 2 * sizeof(void *)) < 0); /* just a noticeable line in the log */ assert(munmap(&main, 0) < 0); int pid = fork(); if (pid < 0) perror_msg_and_fail("fork"); if (!pid) { const unsigned long mask = ~(pagesize - 1); unsigned long addr = (unsigned long) &main & mask; unsigned long size = pagesize << 1; #ifdef HAVE_DLADDR Dl_info info; if (dladdr(&main, &info)) { const unsigned long base = (unsigned long) info.dli_fbase & mask; if (base < addr) { size += addr - base; addr = base; } } else #endif { addr -= size; size <<= 1; } /* Avoid creating core dumps */ (void) prctl(PR_SET_DUMPABLE, 0, 0, 0, 0); /* SIGSEGV is expected */ (void) munmap((void *) addr, size); (void) munmap((void *) addr, size); error_msg_and_skip("SIGSEGV did not happen"); } int status; assert(wait(&status) == pid); assert(WIFSIGNALED(status)); assert(WTERMSIG(status) == SIGSEGV); /* dump process map for debug purposes */ close(0); if (!open("/proc/self/maps", O_RDONLY)) (void) sendfile(1, 0, NULL, pagesize); return 0; }